Replicate Table DDL Changes to other schema..!!

Question

Hello All,
I have two schemas SCH1 and SCH2
SCH1 : TBL1
SCH2 : A_TBL1
Our requirement is whenever we create a table in SCH1 for Eg TBL2 there should be some code which will create A_TBL2 table automatically in SCH2.. Both TBL2 and A_TBL2 should have same structure.. This functionality i can manage using "ON CREATE OR ALTER" Trigger..
But now if in SCH1 we do ALTER TABLE... on TBL2.. same changes has to be applied to A_TBL2 in SCH2.. I have no idea how i could manage this ALTER TABLE change..
Please any help would be greatly appreciated..
Here's the trigger i did for create table..
create or replace
TRIGGER DDL_APPLY_TO_SCH2
AFTER ALTER OR CREATE ON SCH1.SCHEMA
DECLARE
VSTR  VARCHAR2(255);
VJOB NUMBER;
BEGIN
        IF  ORA_DICT_OBJ_TYPE = 'TABLE' THEN
        VSTR := 'EXECUTE IMMEDIATE ''CREATE TABLE SCH2.A_'||ORA_DICT_OBJ_NAME||' AS SELECT * FROM '||ORA_DICT_OBJ_NAME||''';';
        DBMS_OUTPUT.PUT_LINE(VSTR);
        DBMS_JOB.SUBMIT( VJOB, VSTR );       
        END IF;
END;Thanks - HP

Answer 1

Ora_User_2 wrote:
Hello All,
I have two schemas SCH1 and SCH2
SCH1 : TBL1
SCH2 : A_TBL1
Our requirement is whenever we create a table in SCH1 for Eg TBL2 there should be some code which will create A_TBL2 table automatically in SCH2.. Both TBL2 and A_TBL2 should have same structure.. This functionality i can manage using "ON CREATE OR ALTER" Trigger..
But now if in SCH1 we do ALTER TABLE... on TBL2.. same changes has to be applied to A_TBL2 in SCH2.. I have no idea how i could manage this ALTER TABLE change..
Please any help would be greatly appreciated..
Here's the trigger i did for create table..
create or replace
TRIGGER DDL_APPLY_TO_SCH2
AFTER ALTER OR CREATE ON SCH1.SCHEMA
DECLARE
VSTR  VARCHAR2(255);
VJOB NUMBER;
BEGIN
IF  ORA_DICT_OBJ_TYPE = 'TABLE' THEN
VSTR := 'EXECUTE IMMEDIATE ''CREATE TABLE SCH2.A_'||ORA_DICT_OBJ_NAME||' AS SELECT * FROM '||ORA_DICT_OBJ_NAME||''';';
DBMS_OUTPUT.PUT_LINE(VSTR);
DBMS_JOB.SUBMIT( VJOB, VSTR );       
END IF;
END;Thanks - HPThis is not a good idea but you can use that,first you can check if object(table) exits then you can drop this table and can create again using VSTR := 'EXECUTE IMMEDIATE ''CREATE TABLE SCH2.A_'||ORA_DICT_OBJ_NAME||' AS SELECT FROM '||ORA_DICT_OBJ_NAME||''';'* it means trigger will fire after alter event du to there will not any problem,so first check if this table exits then drop and create again ,so you will get changed table.